Liquid dispenser



July 2, 1935. LOBL 2,006,467

LIQUID DISPENSER Original Filed Oct 13, 1930 NI ENTU R Patented July 2,1935 UNITED STATES LIQUID DISPENSER 7 Frederick Lobl, Middleboro, Mass.

Substitute for application Serial No. 488,384, Go-

tober 13, 1930. 'This application March 23, 1934, Serial No. 716,959 1 3Claims. (Cl. 128 -2233) This application is a substitute for an allowedforfeited application, Ser. No. 488,384, filed Oct. 13, 1930.

The present invention relates to medicine dispensing utensils commonlycalled medicine droppers. The ejection of exactly a single drop with theknown medicine droppers was altogether dependent upon the skill of theperson using the dropper. This was due to the fact that there was acommon air chamber serving for both intake of medicine and ejectionthereof. This chamber forms usually the interior of a bulb which whencompressed effects the ejection of one or more drops of medicine. Thesize of drop varies with the specific gravity and the viscosity of theliquid and to some extent'the drop varies also in size with theconditions under which it is formed. A drop is usually considered equalto a minim but varies considerably'from this value. It is an object ofthe invention to provide an improved medicine dispenser by means ofwhich very small quantities of liquid are ejected in predeterminedvolume. This object is achieved by providing the bulb of the medicinedispenser with two chambers communicating with each other, but bothchambers being closed to the outer air when the implement is in use. Oneof these chambers is of such'size that compression of that portion ofthe bulb which may be termed the ejecting portion thereof, will. causethe ejection of exactly the intended predetermined quantity of liquid.Particularly when toxic substances are applied it is of greatestimportance to observe strictly the prescribed dose.

The drawing illustrates two different forms of construction of thesubject-matter of the invention.

In the upper figure of the drawing one form of construction of theimproved medicine dispenser is shown. It comprises a tube or stem 4having at its reduced terminal portion 2 an orifice which serves toadmit entrance or ejection of liquid when the bulb 6 is on the one handfirst compressed and then released and on the other hand onlycompressed. The bulb 6 consists of rubber or other suitable flexiblematerial and has a flange 8 which creates an airtight union of the bulbwith the tube 4 which usually consists of glass. I If desired, however,vthe bulb and 50 tube may be made integral as in an ear, eye, or

ulcer syringe.

In accordance with the invention the rubber bulb has, besides the usualchamber I2 which forms the hollow interior of the portion 6 of the bulb,an additional chamber [4 whch is the interior'of the portion In of thebulb. 'Both chambers are in direct communication with each other 5 p butthey are closed to the outer air. The size of the-chamber l4 oftheportion In is so selected that a predetermined volume of liquid will beejected when the portion ID of the bulb is fullyv compressed. It is, ofcourse, understood that the construction is such that by compressing theportion I0 either a single drop or a predetermined number of drops willbe ejected. It is also obvious that my invention may be employed fordispensing measured drinks. such'as fingers of whiskey, etc; l r I Inthe modification shown in the lower figure of the drawing the shape ofthe bulb 6, I0 differs from the one shown in the upper figure. How-'ever, the function of the modification is the same 20 as described inconnection with the upper figure.

Having thus described my invention what I- claim as new and-desire tosecure as Letters Patent of the United States is: i

1. A liquid dispenser having in combination a delivery tube andanelastic compressible bulb communicating with said tube, said bulb havinga main chamber and an auxiliary chamber of predetermined volume solelyin communication with said main chamber, whereby complete compression ofsaid auxiliary chamber wall causes a predetermined volume of liquidto bedelivered from said tube. V

2. A bulb of elastic compressible material for a medicine dropper havinga main chamber with a delivery opening and an auxiliary chamber ofpredetermined volume solely in communication with said main chamber,whereby complete compression of said auxiliary chamber wall causes adefinite volume of liquid to be delivered from the I 40 dropper.

3. A liquid dispenser having in combination a delivery tube and anelastic compressible bulb in communication with said tube, said'bulbhaving a main chamber and an auxiliary chamber of a

